Road surfacing machine



A ril 17, 1934 N. E. BROWN ROAD SURFACING MACHINE Filed July 31, 1930 3 Sheets-Sheet l a N o a Q Ma 8. Brown INVENTOR ATfORNEYfi April 17, 1934. N 5 BROWN 1,955,224.

ROAD SURFACING MACHINE Filed July 51, 1930 3 Sheets-Sheet 2 L M2 519mm? INVENTOR BY mafia ATTORNEY5 April 17, 1934. N. E. BROWN 1,955,224

ROAD SURFAC ING MACHINE Filed July 31, 1930' 3 Sheets-Sheet 3 INVENTOR ATTOR N EY5 Patented Apr. 17, 1934 UNITED STATES istazz i PATENT OFFER 5 Claims.

vided whereby the surface of a road may be eflec tively packed and provided with a uniform surface.

A further object is to provide a device of the type described in which novel means is provided for tamping or compressing high spots in a road surface, and in which I have entirely eliminated the necessity for scraping down the spots.

A further object is to provide a device of the type described in which a rotating surface finishing device is employed and in which said device comprises a plurality of rotatable rollers, each independent of the others, and arranged in such a manner that a single roller contacts with the road surface at any given time.

Other objects and advantages will appear in the following specification, and the novei features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming part of this application, in which Figure 1 is a side elevation of my device, certain parts being broken away for the sake of clearness,

Figure 2, is a top plan view, partly in section, of the structure shown in Figure 1,

Figure 3 is a sectional view taken along the line 3-3 of Figure 2,

Figure 4 is an enlarged detail view of my adjusting mechanism,

Figure 5 is a sectional view taken along the line '5-5 of Figure 4, and

Figure 6 is an enlarged detail of a portion of my invention.

In carrying out my invention, I make use of a frame 1 mounted upon supporting axles 2 associated with sprockets 3 and 4, about which caterpillar chains 5 are disposed. Constructions of this type are of course well known in the art and therefore require no detailed description. The frame 1 is provided with supporting members 6 upon which a motor 7 may be mounted. The frame is provided with a block 8 upon opposite sides, see Figures 1, 4, and 5, for supporting a shaft 9. A road surfacing mechanism 10, see Figures 1 and 2, is mounted upon the shaft 9. The blocks are grooved upon their ends and disposed in operative engagement with guide memhere 11, see Figure 4. The blocks are provided with threaded openings 12 for receiving screws 13 and 14. Since each block and its associated mechanism is identical in construction, the description at the resent time will be confined to a single unit.

The screw 13 passes through a bearing 15 and is provided with a collar 16 which is pinned to the screw and lies adjacent one end of the bearing. The bearing is of course secured to a portion of the frame 1. The screw 14 is similarly provided with a bearing and a collar. The screws 13 and 14 are provided with gears 1'7 and 13 which are disposed in. mesh. The screw 13 is extended as at 19 for receiving a worm gear 20. The latter is arranged in mesh with a worm 21 upon a shaft 22. One end of the shaft is supported by means of a bearing 23, which, in turn, is supported by a portion of the frame 1. Rotation of the shaft 22 will cause a movement of the block 8 upwardly or downwardly, depending upon the direction in which the shaft is rotated.

In referring to Figure 2, it will be noted that the shafts 22 are provided with bevel gears 24 which are arranged in mesh with bevel gears 25, see Figure 1. The latter gears are mounted upon 86 shafts 26. The opposite ends of these shafts are provided with bevel gears 2'7, which, in turn, are disposed in mesh with bevel gears 28.

The bevel gears 28 are associated with shaft portions 29, which, in turn, are associated with suitable clutch mechanisms 36. Shaft portions 31 may be connected with the shaft portions 29 through the medium of clutches 32. The shafts 31 are provided with sprockets 33, about which chains 34 are placed. These chains are connected with relatively large sprockets 35, which are mounted upon the shaft 9, see Figure 1. The shafts 31 may be connected with the motor '7 through the medium of bevel gears 36 upon one side of the motor and a shaft 37 upon the opposite side. One of the gears 36 may be connected with a shaft 38 through the medium of a clutch 39. A plurality of gears 40 is provided which are arranged for operatively connecting the motor with the transmission mechanism within the housing comprising a part of the rear axle 3. A suitable steering mechanism 41 may be provided. Steering mechanisms and transmission mechanisms such as are employed in connection with the caterpillar type of power driven vehicles are old and well known in the art and therefore require no detailed description.

The shaft 9 is provided with a plurality of plates 52, see Figures 2 and 3. The plates are arranged in spaced-apart relation and are held in spaced-apart relation by means of spacing blocks 53. In Figure 6 I have shown plates 54 which are disposed upon the ends of the shaft. The plates 52 and 54 support a plurality of rollers 55.

In referring to Figures 1, 2, and 3, it will be noted that the rollers are positioned so that only a single roller may engage the surface of the roadbed. The rollers are rotatably mounted as upon shafts 56 carried by the plates. The spacing blocks 53 are preferably provided with lugs 57, see Figure 2, which project through openings in the plates. The spacing blocks are, in turn, secured to the shaft 9 by means of pins 58. Thus it will be seen that the entire assembly is rigdly mounted upon the shaft 9 and will of course rotate with the latter.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. The rollers 55 are spirally arranged. The arrangement is such that when one of the rollers engages the surface of the road, the entire weight of the roller assembly is concentrated upon a small area of the road surface through the medium of the contacting roller. The roller assembly rotates in a direction opposite the rotatioin of the sprocket wheels 3 and 4. The rollers 55 are independently mounted and mounted for rotation about their supporting shafts. An important feature in connection with the concentration of the weight of the roller proper is the fact that hard spots in the road surface are effectively beaten down.

The compressing action is in a sense a direct drive as that common to a tamping tool. The

road surface may be successfully finished by reason of the spiral arrangement of the rollers which permits a concentrated force upon small areas.

portable frame, a rotatable shaft mounted on the frame, rigid roller-supporting means and means by which it is fixedly secured to the shaft, a plurality of tamping rollers, and closely fitting bearings for said rollers on said supporting means.

2. A mobile tamping machine comprising a portable frame, a rotatable shaft mounted on the frame, a roller assemblage comprising a plurality of sets of tamping rollers spirally arranged around the shaft, and rigid supporting means for each set of rollers having means for its securement to the shaft, said rollers being circumferentially spaced to enable concentrating the weight of the entire assemblage on a road surface as successive rollers engage therewith.

3. A mobile tamping machine comprising a portable frame, a rotatabl shaft mounted on the frame, a roller assemblage comprising a plurality of sets of tamping rollers spirally arranged around the shaft, rigid supporting means for each set of rollers having means for its securement to the shaft, said rollers being circumferentially spaced to enable concentrating the Weight of the entire assemblage on a road surface as successive rollers engage therewith, bearing blocks carrying the supporting means, and a screw shaft and gearing arrangement mounted on the frame and having driving connection with the blocks for raising and lowering the blocks and regulating the height of the assemblage with respect to the road surface.

4. A mobile tamping machine comprising a portable frame, a rotatable shaft mounted on the frame, a plurality of tamping rollers in permanent radial relationship With respect to the shaft, and rigid plates fixedly secured to the shaft having closely fitting bearings at their substantial extremities for the rollers.

5. A mobile tamping machine comprising a portable frame, means for moving the frame in one direction along a road surface, a rotatable shaft mounted on the frame, a plurality of tamping rollers in permanent radial relationship with respect to the shaft, and means for revolving the shaft counter to the direction of movement of the frame.

NAT ELMER BROWN. 

